signal SIGIO, code <num>

  Explanation:  An 'asynchronous I/O' signal was raised as an
  exception in response to the arithmetic or software condition
  specified by the given code.  SIGAIO (base lan i/o), SIGPTY (pty
  i/o), and SIGPOLL (STREAMS i/o) are other names for this signal.

  User Action:  Eliminate the cause of the error condition and
  retry the operation.